eMonocot Cyperaceae

an authoritative resource for Cyperaceae data worldwide, integrating global and regional perspectives

Phylogeny and classification of Carex section Ovales (Cyperaceae)

Publication Type:Journal Article
Year of Publication:2006
Authors:Hipp, A. L., Reznicek, A. A., Rothrock, P. E., Weber J. A.
Journal:International Journal of Plant Sciences
Volume:167
Pagination:1029-1048
Keywords:ancestral character state reconstruction, Carex section Ovales, Carex section Stellulatae, Carex subgenus Vignea, DNA, evolution, hybrid speciation, incongruence, intergenic spacer, length difference test, model, north-america, nuclear, ribosomal DNA, sedges carex, SEQUENCE DATA, vignea cyperaceae
Abstract:

Section Ovales is the most species-rich section of the sedge genus Carex in the New World. Phylogenetic analyses of molecular data recover a predominantly New World clade as sister to a solitary east Asian species, C. maackii. Nuclear ribosomal DNA are congruent in the placement of all taxa within the section, with a solitary exception: incongruence between ITS and ETS data in the placement of C. bonplandii and C. roraimensis suggests a hybrid origin for this lineage. Biogeography correlates strongly with phylogeny in the section, but there have been at least two instances of long-range dispersal, one from an eastern North American clade to western North America and one from the New World to Eurasia. Morphological characters studied are all homoplastic. Developing a comprehensive infrasectional classification with a phylogenetic basis would be complicated by the fact that most of the novel morphological characters in the section have evolved within relatively small, independent clades.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith